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• W1936694663 abstract "The enzymatic mechanism of primase was investigated using Escherichia coli and baculoviral overexpressed mouse primase subunits, p49 and p58. Neither of the singly purified primase subunits displayed primase activity alone, but the p49 subunit was able to extend a riboprimer, indicating that this subunit contains an RNA polymerase activity. The p58 subunit cooperated with the p49 subunit in binding the initiating purine to form the initial dinucleotide. After initiation, the p49 subunit alone was sufficient to extend the growing primer, but both the rate of p49 primer extension and its stability were influenced by the p58 subunit. The Km(ATP) in primer synthesis on poly(dT) of the p49-p58 heterodimeric primase complex was 10-fold higher than the Km(ATP) of the single p49 subunit in a ribo(A) primer extension assay. In addition, labeled ATP cross-linked to both of the individually purified subunits but with a striking difference in affinities; cross-linking was 11-fold more efficient to the p49 subunit. The interaction of the two primase subunits with polymerase alpha was also investigated. Immunoprecipitation experiments indicate that only the p58 subunit directly contacts the p180 subunit of DNA polymerase alpha. Competition experiments in the coupled primase-polymerase assay with a catalytically inactive mutant of DNA polymerase alpha and the Klenow fragment suggest that the DNA polymerase alpha-primase complex does not dissociate from the primer during the transition from RNA to DNA synthesis." @default.
• W1936694663 created "2016-06-24" @default.
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• W1936694663 date "1993-12-01" @default.
• W1936694663 modified "2023-10-13" @default.
• W1936694663 title "Enzymatic characterization of the individual mammalian primase subunits reveals a biphasic mechanism for initiation of DNA replication." @default.
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• W1936694663 doi "https://doi.org/10.1016/s0021-9258(19)74297-5" @default.
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